• Iliya (52/52) Mar 11 2021 Hello.
• =?UTF-8?Q?Ali_=c3=87ehreli?= (3/4) Mar 11 2021 Your program links fine for me with 2.094.2 on Linux.
• Iliya (14/18) Mar 11 2021 Thank you, Ali!
• rikki cattermole (3/3) Mar 11 2021 Try it with:
• Iliya (6/9) Mar 17 2021 Good workaround for such kind of bugs! )
• Imperatorn (4/7) Mar 17 2021 The error message could maybe be changed to include this? "Try

Iliya <iliya.grachev gmail.com> writes:

Hello.

I am using dmd 2.094.1 on linux for compiling a piece code I 
found on the github. Unfortunately linker can't link it as it 
can't find opCall symbol instantiation demangled as:

pure nothrow  nogc  safe bool 
app.IsEqual!(char).IsEqual.opCall(in char, in char)

Do you have any ideas on:

1. Why compiler searches for such function attributes - pure 
nothrow  nogc  safe, as I don't specify them. Is this a bug or 
feature?)

2. What changes are needed to compile this rather simple example.


Please, help me!


Reference to my piece of code in app.d:

struct IsEqual(T)
{
     static bool opCall( in T p1, in T p2 )
     {
         return p1 == p2;
     }
}


size_t find(T, Pred = IsEqual!(T))
     (in T[] haystack, in T needle, Pred pred = Pred.init)
{
     foreach ( pos, cur; haystack )
     {
         if( pred( cur, needle ) )
             return pos;
     }
     return haystack.length;
}


int main(string[] args)
{
     auto pos = find("abc" , 'b');
     assert(pos == 1);

     return 0;
}


Linker error message:

Linking...
/usr/bin/ld: 
.dub/build/application-debug-linux.posix-x86_64-dmd_2094-BD99179F1B52B13DDA1C2B0
72F5081E/app.bin.o: in function
`_D3app__T4findTaTSQq__T7IsEqualTaZQlZQBcFNaNbNiNfIAaIaQBlZm':
source/app.d:15: undefined reference to 
`_D3app__T7IsEqualTaZQl6opCallFNaNbNiNfIaIaZb'
collect2: error: ld returned 1 exit status


ddemangle output on these symbols:

_D3app__T7IsEqualTaZQl6opCallFNaNbNiNfIaIaZb
pure nothrow  nogc  safe bool 
app.IsEqual!(char).IsEqual.opCall(in char, in char)

_D3app__T4findTaTSQq__T7IsEqualTaZQlZQBcFNaNbNiNfIAaIaQBlZm
pure nothrow  nogc  safe ulong app.find!(char, 
app.IsEqual!(char).IsEqual).find(in char[], in char, 
app.IsEqual!(char).IsEqual)


Thanks you!

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

On 3/11/21 8:41 AM, Iliya wrote:

 I am using dmd 2.094.1 on linux

Your program links fine for me with 2.094.2 on Linux.

Ali

Iliya <iliya.grachev gmail.com> writes:

On Thursday, 11 March 2021 at 17:25:35 UTC, Ali Çehreli wrote:
 On 3/11/21 8:41 AM, Iliya wrote:

 I am using dmd 2.094.1 on linux

 Your program links fine for me with 2.094.2 on Linux.

 Ali

Thank you, Ali!

I also played with it on playground. Seems that it is a bug.
The compilation results:

Up to      2.093.1: Success and no output
Since      2.094.1: Failure with output:
-----
onlineapp.o: In function 
`_D9onlineapp__T4findTaTSQw__T7IsEqualTaZQlZQBcFNaNbNiNfIAaIaQBlZm':
/sandbox/onlineapp.d:15: undefined reference to 
`_D9onlineapp__T7IsEqualTaZQl6opCallFNaNbNiNfIaIaZb'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
-----

rikki cattermole <rikki cattermole.co.nz> writes:

Try it with:

-allinst

It may just be deciding a template instance isn't required.

Iliya <iliya.grachev gmail.com> writes:

On Thursday, 11 March 2021 at 17:41:27 UTC, rikki cattermole 
wrote:
 Try it with:

 -allinst

 It may just be deciding a template instance isn't required.

Good workaround for such kind of bugs! )

Up to      2.063  : Failure with output: Error: unrecognized 
switch '-allinst'
Since      2.064  : Success and no output

Imperatorn <johan_forsberg_86 hotmail.com> writes:

On Thursday, 11 March 2021 at 17:41:27 UTC, rikki cattermole 
wrote:
 Try it with:

 -allinst

 It may just be deciding a template instance isn't required.

The error message could maybe be changed to include this? "Try 
-allinst bla bla"